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backend/drm: Implement support for renderer loss recovery

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This implementation is nearly identical to Sway's, except that
it also reloads the configuration, to spur on reloading the
server-side decorations.

v2: Fix style.
v3: Add a reset to the magnifier.
v4: Oops, restructure reset handler a bit.
v5: Commit the magnifier reset immediately, before freeing the
    lost allocator and renderer.
v6: Also check for failed render pass, which may return NULL.
v7: Add a second NULL test, just in case.
This commit is contained in:
Christopher Snowhill 2024-07-17 17:13:51 -07:00 • committed by Consolatis
parent e934c7a417
commit 3879f1f080
4 changed files with 76 additions and 4 deletions
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28
src/magnifier.c
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@ -10,6 +10,10 @@
static bool magnify_on;
static double mag_scale = 0.0;
/* Reuse a single scratch buffer */
static struct wlr_buffer *tmp_buffer = NULL;
static struct wlr_texture *tmp_texture = NULL;
#define CLAMP(in, lower, upper) MAX(MIN((in), (upper)), (lower))
void
@ -21,10 +25,6 @@ magnify(struct output *output, struct wlr_buffer *output_buffer, struct wlr_box
struct wlr_fbox src_box;
bool fullscreen = false;
/* Reuse a single scratch buffer */
static struct wlr_buffer *tmp_buffer = NULL;
static struct wlr_texture *tmp_texture = NULL;
/* TODO: This looks way too complicated to just get the used format */
struct wlr_drm_format wlr_drm_format = {0};
struct wlr_shm_attributes shm_attribs = {0};
@ -125,6 +125,10 @@ magnify(struct output *output, struct wlr_buffer *output_buffer, struct wlr_box
/* Extract source region into temporary buffer */
struct wlr_render_pass *tmp_render_pass = wlr_renderer_begin_buffer_pass(
server->renderer, tmp_buffer, NULL);
if (!tmp_render_pass) {
wlr_log(WLR_ERROR, "Failed to begin magnifier render pass");
return;
}
wlr_buffer_lock(output_buffer);
struct wlr_texture *output_texture = wlr_texture_from_buffer(
@ -152,6 +156,10 @@ magnify(struct output *output, struct wlr_buffer *output_buffer, struct wlr_box
/* Render to the output buffer itself */
tmp_render_pass = wlr_renderer_begin_buffer_pass(
server->renderer, output_buffer, NULL);
if (!tmp_render_pass) {
wlr_log(WLR_ERROR, "Failed to begin second magnifier render pass");
goto cleanup;
}
/* Borders */
if (fullscreen) {
@ -286,6 +294,18 @@ magnify_set_scale(struct server *server, enum magnify_dir dir)
}
}
/* Reset any buffers held by the magnifier */
void
magnify_reset(void)
{
if (tmp_texture && tmp_buffer) {
wlr_texture_destroy(tmp_texture);
wlr_buffer_drop(tmp_buffer);
tmp_buffer = NULL;
tmp_texture = NULL;
}
}
/* Report whether magnification is enabled */
bool
is_magnify_on(void)